Albert ball



(No Model.)

A. BALL. GANG DRILL OHANNELING MACHINE.

Patented May 19,1891.

WITNESSESI QMSLMW T285 co., mom-um UNITED STATES I PATENT, OFFICE ALBERTBALL, OF CLAREMONT, NE\V HAMPSHIRE, ASSIGNOR TO THE SULLIVAN MACHINECOMPANY, OF SAME PLACE.

GANG-DRILL CHANNELlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 452,354, dated May 19,1891. Application filed June 23,1890. Serial No.356,4=77. (No model.)

To all whom it may concern.-

Be it known that I, ALBERT BALL, a resident of Claremont, in the countyof Sullivan and State of New Hampshire, have invented certain new andusefulImprovements in Gan g- Drill Channeling-Machines; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use the same.

The invention is an improvement upon a drillholder suitable for agang-drill channeling-machine for which patent was granted December 13,1887, to Albert Ball, and numbered 374,818, and its objects are toperfect the details of construction in machines of such character; anditconsists in the matters heieinafterset forth, and particularly pointedou In the accompanying drawings, Figure 1 is a front elevation of across-head Fig. 2 is an edge view of the same. Fig. 3 is a verticalcentral section from front to rear. Fig. 4 is a horizontal section online B L of Fig. 1. Fig. 5 is a bottom View, and Fig. 6 is a perspectiveof a detail.

The reference-letter A denotes the headpiece of a drill-holder, and E apiston-rod keyed thereto.

b indicates a recess formed in the head about the piston-rod, where itenters the drillholder, to receive oil or water that works down on therod from the cylinder. A groove (indicated by e) is formed in the rodand made to connect with a channel d in the head, whereby liquid matterwhich enters the receptacle Z7 is conveyed to the back of thecross-head. A channel such as indicated by dotted lines at M might bemade tosubserve the same purpose. Itis of course immaterial whetherchannel 6 is formed in the rod or in the head, and more than one may beused, if desired. It is also immaterial whether the piston-rod itself bekeyed directly to the drillholder (or cross-head) or whether aconnecting-rod be used.

It is necessary to set the cross-head very firmly upon the piston-rod orconnectingpiece, and ordinarily hammering is required to remove it afterthe removal of the locking device. To avoid such objectionablehammering, a passage 0 is provided in the head at the bottom of the rod,which when screwthreaded, as shown, will permit the use of a screw toforce the rod from its seat. A jack might be employed for this purpose,in which case the passage would not require to be threaded.

Heretofore a piston-rod has been loosened by forcing a pin against itsfoot by means of a gib and wedge applied through atransverse opening. Itis characteristic. of my device that the opening in the bottom of thepistonsocket is located in an offset A of the head and is directlyaccessible, and that a releasing device can be applied in direct linewith the rod and without the intervention of a wedge or other likemeans.

J indicates one of the clamps adapted to be held by means of screw-boltsagainst the drills in the head. K is a set-screw, and C a piece of steelmade specially hard and secured in the iron or steel head A. The objectof this hard piece of metal is to obviate the wearing or tearing effectof the screw upon the comparatively soft metal of the head. Theparticular form of the disk or piece is not material. A single stripmight be substituted for the three disks shown, and other metals oralloys of peculiar hardness could be used instead of hard steel.

The drills make about three hundred blows against the solid rock perminute and are not held with sufficient security byordinaryboltfastenings. I provide the clamp with an'otfset J, andarrange a set-screw therein transverse to the usual bolt. These boltsrequire to be screwed up hourly, and the very best steel will be wornaway under the repeated operations. I am aware that hard-metal pieceshave been used in soft-metal fastenings to resist the wear of screws inmill-spindles, and such device is not broadly of my invention. Ordinaryhard metal such as here tofore used in connection with the brassbearings of mill-spindles will not answer the purpose of my improvement,as such bearing plates would not be harder than are my drillholders inwhich specially-hardened plates are secured. Further, my construction issuch that the screw-heads are exposed and directly accessible, which isa feature of importance in a structure which requires very frequenttightening of the screws.

The guides of the head are denoted by 1) D and D D indicate gibs toprotect the same. They are made angular or L-shaped, as shown, and areapplied to the exterior corners of the guides with their lower endsresting upon shoulders or flanges a a, respectively.

F denotes abcaring-plate resting upon their upper ends.

G G are elastic washers or packings, and II II are metal washers, and II cap-screws for forcing these parts together to hold them firmly inposition. The elastic washer, which may be made of leather or likematerial, prevents the breaking off of the caps or heads of the screws.A spring may be substituted for theleather washer or packing with anequivalent effect. In use these gibs will become upset and shortened,and the screws provide means for remedying this by suitably screwing theparts together when required, thus obviating lost motion of the gibs.

It will be understood that the above-described devices can be employedin machines widely differing in other respects; and I do not wish to beunderstood as limiting the improvements to any particular form ofgangdrill.

I am aware that a split ring has been applied to a piston to arrest orscrape off water passing down through a stuffing-box, said ring having adownwardly-inclined surface to conduct the water into a receptacleprovided with a discharge-pipe. I am also aware that a cylinder, nut,and screw-threaded stud have been interposed between the end of apistonrod and a wrist-pin of a cross-head, the device being maderemovable, and that removable keys or wedges have also been used toprovide for detaching piston-rods and crossheads; an d, further, I amaware that gibs have been clamped to cross-heads by screws, and I do notbroadly claim devices for effecting these various objects.

My improvement for removing water requires no new parts, but simply arecess in the top of the head adjacent to the rod, and a channel formedeither in the rod or in its seat, leading away from the drills. Myimprovement for detaching the piston-rod and drill-head is simple, andrequires no complicated supplementary parts. My device for holding andsupporting gibs dispenses with transverse screws and slots and recess togive access to said screws, and it supports them at their ends only.

llaving now described my invention, what I desire to secure by LettersPatent is- I. In a drillinganachine, a drill-holder head combined with apiston-rod and provided with a recess in the top of said head andimmediately adjacent to the rod to receive liquids that run down on therod, and apassage leading from said recess and extending between the rodand head and out through the rear of the latter to convey them to therear of the drill-head, substantially as set forth.

2. In adrilling-machine, a drill-holder head combined with apiston-rod,said head having a socket to receive the rod, a movable device forholding the rod in said socket, and an opening extending through itswall to the foot of the rod, said socket being located in :1 lateralextension or offset of the head, whereby a simple straight device can beforced directly against the foot of the red by power applied immediatelyagainst its end, substantially as set forth.

3. In a drilling-machine, a drill-holder head provided with guideshaving shoulders at their bottom to support gibs, and devices forforeing the gibs down lengthwise upon the shoulders, substantially asset forth.

4. In adrilling-machine, a drill-holder head having guides provided withshoulders, angular or L-shaped gibs adapted to embrace the angles of theguides, and screws to force the gibs down upon the flanges,substantially as set forth.

5. In a drilling-machine, adrill-holder head having guides provided withshoulders, angular or L-shaped gibs adapted to embrace the angles of theguides, a bearing-plate, and screws to force the gibs down upon theflanges, substantially as set forth.

6. In a drilling-machine, a drill-holder head having guides providedwith shoulders, an gular or L-shaped gibs adapted to embrace the anglesof the guides, a bearing-plate, an elastic washer or spring, a metalwasher, and screws to force the gibs down upon the flanges,substantially as set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

ALBERT BALL.

Witnesses:

FRANK A. BALL, 0. B. RICE.

